Lamination for dynamo-electric machines



Sept. 22, 1931. R H, JORDAN 1,823,979

LAMINATION FOR DYNAMO ELECTRIC MACHINES Filed May 3, 1929 Figi.

INVENTOR R ich ard H. Jordan.

TTORNEY Patented Sept. 22, 1931 yUNITEI) STATES PATENT oEFlcE- c RICHARD H. JORDAN, F SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO HOUSE ELECTRIC MANUFACTURING COMPANY, A CORPORATION 0F PENNSYL- VANIA LAMINATION FOR DYNAMO-ELECTRIC MACHINES Application ined May s, 1929.l serial No. 360,279.

mit the use .of small shading coils While obtaining comparatively large shaded-pole areas.

Another object of my invention is to provide a salient pole piece having a slot there- 1n for the reception of one side of a shading coil of resilient metal, thereby eliminating` the need of additional holding means.

In practicing my invention, I provide a punching of magnetic material with a plurality of pole pieces integral therewith and extending radially therefrom, each of said pole pieces having a shading-coilv slot therein extending substantiallytangential to the surface of a cylin er that is concentric With the inner faces of the pole pieces and being particularly adapted to receive one side of a shading coil of inherent resiliency.

In the single sheet ofdrawin'gs,

Figure 1 is a view, in front elevation, `ofa single lamination having a plurality of pole pieces and shading-coil slots therein,

Fig. 2 is a view, in front elevation, of a plurality of laminations partially wound,

vthe main field coils being shown in section,

Fig. 3 is a View, in longitudinal section, of a plurality of assembled laminations taken on the line III-III of Fig. 2, the field coils being omitted,

Fig. 4 is an end view of a resilient shading coil, and

J Fig. 5 is a top plan view of the same shading coil.

A sheetfsteekpunching comprises a yoke portion 11, a plurality of salient pole pieces 12 integral therewith and extending radially therefrom, each pole piece being substantially symmetrical relative to a radial line therethrough, a. plurality of peripherally spaced holes 13 being provided for receiving rivets 14, (see Fig. 3) the end of which may be housing (not `As these latter elements constitute no lpiece faces.

headed over. A set of laminations is adapted to be held in proper operative position in a shown) by supporting rods (not shown) which extend through holes 16. part of my invention and are well known in the art, I have not deemed it necessary to illustrateor describe them in detail.

Referring to Fi v2 and 3, I show a plurality of assemble laminations each ,includ- 'ing the yoke portion 11 and a plurality of salient pole pieces 12, each of said pole pieces having a pole face the peripheral width of which is substantially larger than the peripheral width of its neck portion. One side of a resilient shading coil 17, (Figs. 4 and 5), is located in a shading-coil'slot l8fthat is substantially parallel to one side of the pole iece 12 which contains it, the shading coil eing of substantially rectangular form, the longer sides of which aresprung inwardly during the process of manufacture. When placed in operative position von the pole piece 12, the shading coil lassumes theform indicatedby'the-broken lines in Fig. .land is held in proper operative position by its inherent resiliency.

Flexible insulating material 21 adaptable to any irregularities ip the inner contour of said laminations, extends alongr the inner periphery of the yoke between 'the pole pieces and also along the outer surfaces of the pole pieces. A coil 22, of proper form vand size, and representedin section, is located in proper operative position around the neck portion of each of the pole pieces 12, substantially as shown in Flg. 2.

I have shown laminations suitable for mounting inside a supportingA frame of a dynamo-electric machine and adapted for the reception of a rotor between the vaxis of the said laminations and the periphery of its pole- It is obvious that my invention is not limited to stator laminations but may' be applied to either stator or -rotorlaminations or to both.

By using a substantially symmetrical pole piece, the saturation of the punching is substantially equal all along the iux path, and the addition of a shading-coil slot substantiallyl tangential to a cylinder that is concentric with the pole faces ofthe laminations requires only a shading coil, of small Width, and results in a decrease in the copper loss therein, while obtaining a relatively large shaded-pole area.

.It will also be noticed that, by producing substantially symmetrical pole pieces thesize of the laminations, and, consequently,

that of the entire machine may be decreased for a given output, since the available iron is made more efective,both electrically and mechanically, or, conversely, a greater maincoil area and resultant greater output may 'be obtained for a given stator punching.

" Among the several advantages of my in- -vention are the simplicity of installing pole windings and their subsequent ease of re, placement, economy in manufacture, and added eiiiciency of operation because of better action of the larger shadedpole area and the increased main-coil area.

Various modiiications may be made in the device embodying my invention withoutdeparting from the spirit and scope lthereof, and -I desire, therefore, that only such limii vtations shall be placed thereon as ae imposed by. the prior art or set forth in the appended claim.

I claim as my invention:

A laminated core structure embodying a l plurality of laminations each including a yoke portion, a plurality of pole pieces each having a smaller area of neck portion than the area of the pole face such that the straight sides of the pole pieces are substantially tangential to the cylinder deiined by the polepiece faces and each pole piece being `substantially symmetrical relative to a radial line centrally therethrough, each pole piece having'a slot therein parallel to the adjacent straight side, and a shading coil of resilient metal frictionally gripping the edges of the pole portion enclosed thereby.

In testimony whereof, I havev hereunto i' subscribed my name this 29th day ofApril,

` RICHARD H. JORDAN 

